84121278 has 8 divisors (see below), whose sum is σ = 168242568. Its totient is φ = 28040424.

The previous prime is 84121277. The next prime is 84121283. The reversal of 84121278 is 87212148.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

84121278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84121277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7010101 + ... + 7010112.

It is an arithmetic number, because the mean of its divisors is an integer number (21030321).

Almost surely, 2^84121278 is an apocalyptic number.

84121278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84121278 is a wasteful number, since it uses less digits than its factorization.

84121278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14020218.

The product of its digits is 7168, while the sum is 33.

The square root of 84121278 is about 9171.7652608426. The cubic root of 84121278 is about 438.1625822070.

The spelling of 84121278 in words is "eighty-four million, one hundred twenty-one thousand, two hundred seventy-eight".